Bash tool non-functional on Windows: no executables found in PATH

On Windows, the Bash tool in Claude Code spawns a shell where no executables are found — not Windows tools (cmd.exe, powershell.exe, gh.exe, where.exe), not Unix utilities (cat, find, etc.). Every command fails with "command not found". The tool is effectively non-functional on Windows.

Steps to reproduce:

1. Run Claude Code on Windows
2. Ask Claude to execute any shell command via the Bash tool
3. Observe: /usr/bin/bash: line 1: <command>: command not found

Expected: The Bash tool should work on Windows, either by using a shell with a proper PATH (e.g. Git Bash with system PATH, PowerShell, or cmd) or by documenting clearly that it is unsupported on Windows.

Environment: Windows 10 Pro, Claude Code native (not WSL)